diff --git a/NEWS b/NEWS
index 31ff50f..ed84732 100644
--- a/NEWS
+++ b/NEWS
@@ -5,6 +5,8 @@
  * #860: Fix interaction between environment variable interpolation in constants and shell escaping.
  * #863: When color output is disabled (explicitly or implicitly), don't prefix each log line with
    the log level.
+ * #865: Add an "upload_buffer_size" option to set the size of the upload buffer used in "create"
+   action.
  * #866: Fix "Argument list too long" error in the "spot" check when checking hundreds of thousands
    of files at once.
  * #874: Add the configured repository label as "repository_label" to the interpolated variables
diff --git a/borgmatic/borg/create.py b/borgmatic/borg/create.py
index 1cb9563..b39f72e 100644
--- a/borgmatic/borg/create.py
+++ b/borgmatic/borg/create.py
@@ -371,6 +371,7 @@ def make_base_create_command(
     chunker_params = config.get('chunker_params', None)
     compression = config.get('compression', None)
     upload_rate_limit = config.get('upload_rate_limit', None)
+    upload_buffer_size = config.get('upload_buffer_size', None)
     umask = config.get('umask', None)
     lock_wait = config.get('lock_wait', None)
     list_filter_flags = make_list_filter_flags(local_borg_version, dry_run)
@@ -412,6 +413,7 @@ def make_base_create_command(
         + (('--chunker-params', chunker_params) if chunker_params else ())
         + (('--compression', compression) if compression else ())
         + upload_ratelimit_flags
+        + (('--upload-buffer', str(upload_buffer_size)) if upload_buffer_size else ())
         + (('--one-file-system',) if config.get('one_file_system') or stream_processes else ())
         + numeric_ids_flags
         + atime_flags
diff --git a/borgmatic/config/schema.yaml b/borgmatic/config/schema.yaml
index 5d02771..56a8987 100644
--- a/borgmatic/config/schema.yaml
+++ b/borgmatic/config/schema.yaml
@@ -280,6 +280,11 @@ properties:
             Remote network upload rate limit in kiBytes/second. Defaults to
             unlimited.
         example: 100
+    upload_buffer_size:
+        type: integer
+        description: |
+            Size of network upload buffer in MiB. Defaults to no buffer.
+        example: 160
     retries:
         type: integer
         description: |
diff --git a/tests/unit/borg/test_create.py b/tests/unit/borg/test_create.py
index 3e3dd13..9959919 100644
--- a/tests/unit/borg/test_create.py
+++ b/tests/unit/borg/test_create.py
@@ -693,6 +693,7 @@ def test_make_base_create_command_includes_exclude_patterns_in_borg_command():
         ('one_file_system', True, True, ('--one-file-system',)),
         ('upload_rate_limit', 100, True, ('--upload-ratelimit', '100')),
         ('upload_rate_limit', 100, False, ('--remote-ratelimit', '100')),
+        ('upload_buffer_size', 160, True, ('--upload-buffer', '160')),
         ('numeric_ids', True, True, ('--numeric-ids',)),
         ('numeric_ids', True, False, ('--numeric-owner',)),
         ('read_special', True, True, ('--read-special',)),